Reply to Removing an overlay and opinions on V3 Map vs V4 Map

Hey all, i just purachased my first midi controller (and Traktor Pro 2).

I bought a used Black VCI-100 which has been upgraded to firmware 1.4 and has a V3 Overlay on it plus a chip which he described "adds more resolution and Midi notes to the controller's knobs and jog wheels."

I haven't received it yet so I don't know the big differences between the V3 midi map and the V4 but i feel like the V4 is more popular so I wanted to get a V4 overlay. Problem is that I don't know how removing the V3 overlay will go, I feel like it will be like peeling a sticker which is a delicate process if one doesn't wanna get all the sticky residue everywhere.


So my questions are:

has anyone removed an overlay? How did it go? Any advice?

and

Which map do you prefer and why? V3 or V4?

Thanks so much!